A PROCESS FOR THE PREPARATION OF SILICON ALUMINIUM OXYNITRIDE (SiAlON) FROM FLY ASH IN A THERMAL PLASMA

摘要

A process for the preparation of silicon aluminium oxynitride (SiAlON) from fly ash in a thermal plasma which comprises a mixture of fly ash and carbon in an electrically conducting non-metallic crucible capable of forming the anode, employing mixture of nitrogen and argon as plasmagen gas in a plasma furnace at a temperature of atleast 1400°C for a time period ranging between 10-30 minutes and cooling the desired product in the furnace up to a temperature of 20-3 0°C and collecting it in the form of powder